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    <title>P92 5.2.3 对象成员遍历</title>
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        var obj = { name: 'Tom', age: 16 };
        for (var k in obj) {
            console.log(k + '-' + obj[k]);
        }
        var obj = { name: 'Tom', age: 16 };
        console.log('name' in obj);
        console.log('gendar' in obj);
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        <h2>返回上一页面</h2>
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